Al2O3陶瓷与GH3536真空钎焊接头界面组织与力学性能

doi:10.7527/S1000-6893.2021.25806

Abstract

Abstract: A silver-based active brazing filler alloy Ag-5.0Cu-1.0Al-1.25Ti was used to join Al₂O₃ ceramic and nickel-based superalloy (GH3536) by vacuum brazing. To clarify the formation mechanism of the interface of the brazed joint, the interfacial microstructure and phases composition of the joint were studied by scanning electron microscopy and X-ray diffraction analysis. Meanwhile, the effect of brazing temperature and holding time on the microstructure and mechanical properties of the joint was also analyzed, so as to optimize the brazing parameters. The results showed that the typical microstructure of the Al₂O₃/GH3536 joint obtained at 970℃ for 10 min was Al₂O₃/Ti₃(Cu,Al)₃O/Ag(s,s)+AlCu₂Ti/TiNi₃+TiFe₂/GH3536, and the maximum shear strength of the joint could reach 194 ±10 MPa. With the increase of brazing temperature and holding time, the thickness of Ti₃(Cu,Al)₃O reaction layer increased, the Cu-rich phase gradually decreased, and AlCu₂Ti compounds aggregated. However, the brazing temperature was too high or the holding time was too long, the silver matrix in the brazing seam was replaced by a large amount of AlCu₂Ti compound, which resulted in a significant decrease in the mechanical properties of the joint. Finally, the failure mechanism of the joint was analyzed. Under the action of shear force, the fracture of the joint occurred mainly at the interface of Al₂O₃ ceramic and Ti₃(Cu,Al)₃O reaction layer and the Al₂O₃ ceramic substrate.

Key words: vacuum active brazing, nickel-based superalloy, AgCuAlTi brazing, alumina ceramic, shear strength

CLC Number:

V250.1

YANG Siyuan, WANG Ying, WANG Jilai, YANG Zhenwen, WANG Dongpo. Interfacial microstructure and mechanical properties of vacuum-brazed Al₂O₃ ceramic and GH3536 joint[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(4): 525806-525806.

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Interfacial microstructure and mechanical properties of vacuum-brazed Al₂O₃ ceramic and GH3536 joint

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Interfacial microstructure and mechanical properties of vacuum-brazed Al2O3 ceramic and GH3536 joint

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Interfacial microstructure and mechanical properties of vacuum-brazed Al₂O₃ ceramic and GH3536 joint